Why do people like coloring so much? For grown-ups, I can totally get the nostalgia — and the simple pleasure of creating something.

But here at NPR Ed, we're all about kids and learning. And so, as parents head to the store this summer with their back-to-school lists, we thought this question was worth a serious look:

Do coloring books have any educational value? Do they squash creativity like a bug or, as some sites suggest, promote the development of fine motor skills?

I've seen my daughter bring home worksheets from elementary school, asking her to color in this or that picture after answering a math or word problem. And, I've wondered as I watched her complete these assignments, "Isn't this busywork?"

I eventually tracked down a copy of the book. And right there on Page 176 I found a pretty good confirmation of my original impression: "There is general agreement that coloring books too are detrimental to children's creative expression."

No big surprise, really. And yet, as I read that, I found myself asking: Then why is my kid bringing home these worksheets?

Indeed, two pages later, Lowenfeld is astonished by this, too: "Surprisingly enough, dittoed sheets are still occasionally handed out for youngsters to color that may have outlines of George Washington, a Thanksgiving turkey, a Halloween pumpkin."

Sound familiar?

Despite the fact, he adds, that "there is no evidence that these laboriously colored balloons and kites actually help to develop either number concepts or reading abilities."

What surprised me the most, though, was Lowenfeld's reasoning about why coloring books are bad — at least in terms of schools and learning.

Page 176: "The dependency upon someone else's outline of an object makes children much less confident in their own means of expression. They obviously cannot draw a cow as good as the one in the coloring book."

He's basically asking the question: Why color in a ready-made picture when you can create your own?

Georgia State's Milbrandt explained this further: "When you look at a coloring book, you say, 'Who's making the decisions here?' The image is already there, with little opportunity for the child to construct meaning."

Give kids a blank sheet of paper and ask them to draw a bird. And you'll get all kinds of fanciful images back. But give them a coloring book — where birds are drawn as two connected arcs, like a really wide and curvy "V," and then ask them again to draw a bird on their own. Many kids will start to draw birds in that very simple, "stereotyped" way.

Milbrandt picks another example: the sun. "In our culture, the sun is up in the corner, a yellow ball with yellow rays. If [children] are seeing birds or the sun represented in a particular way, they tend to adopt those as symbols. Just like some children's literature promotes stereotypes of princesses and bad guys."

And, she adds, art education isn't just about teaching kids how to draw or paint or sculpt. "Part of what we encourage children to do through art is to construct meaning and synthesize their understandings of the world. To engage at a deeper level."

Or, to put it in coloring book terms: Don't stay in the lines. Create your own lines.

But wait. I loved coloring when I was a kid. Isn't coloring a fun thing that parents and kids can do together? What about those fine motor skills?

"If the goal is for the child to develop fine motor skills and color inside the line, they may get satisfaction by doing that correctly," Milbrandt says.

But, she adds, you have to make an important distinction here: What is educational vs. what is recreational.

Recreationally, she explains, "I think there is some value in coloring books — if parents are sitting and coloring, it's an opportunity to talk. But at the same time, couldn't parents be sitting and drawing with the child, or painting and creating an artwork?"

That would achieve the same goals: developing motor skills, having fun, bonding ... but in a much more creative way. In economic terms, Milbrandt views coloring in terms of opportunity costs: "It's not that it's bad, but there are other things you could do that would be better."

For art teachers, the message is clear: Step away from the coloring book.

"We need to teach children to celebrate difference rather than celebrate conformity," Milbrandt says.

And what about those teachers, sending home worksheets with the kites and balloons to color in? Let's let Lowenfeld — writing 71 years ago — have the last word:

"Although no one will admit it, one of the main reasons for using these workbooks may well be that they give the classroom teacher a chance to have some rest."